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**1. Homework Statement**

heres the equation: http://img255.imageshack.us/img255/1669/untitledfa5.jpg [Broken]

**2. Homework Equations**

i think we use cos(x)

**3. The Attempt at a Solution**

i know that cos(x) = cos(pi)

so the limit is -1?

whats the sum, i'm a bit confused.

must be in simplest form

what must i show. help.

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